At f n t o f fic



Sept. 61,1927.

s LARsoN Loox Filed April s. '1924 plates 12, all engaging rockably, asby notch l Patented ,I Y

" 'SHURE Lesson, osivoRWAY, IOWA; y

lcn

vWhichz- .LOCK-@M Application vfiled April .5,

This invention relates to permutation looks yused' mainlypffor'doors,and the `object of theinvention is to produce a lock of thistypeivhichais very, simplevin construction andoperation; capableof'almost infinite variation;`` not easily pickable, and beine,constructed Without springs; is Very durable.

:The invention is fully disclosed inthe description and claims,lfollowing,- reference boing hadto ,the` accompanying,` drawing, in j 1isa side elevation of a lock embodyfing the invention. `as ,n applied to agravity door-latch ,hereafterQreferred to. Fig. 2 is ,cross-section ofthe same, in the line 2-2 of llig'.A 1, looking toward the'leit.r Fig.`3

y is a sectionalrview, longitudinal to the. lock member for a: swinging,gravity latch 45 casing', showing the operating parts of the lock infull. `V`Fig. 4 is across-section of the f same in the lined-,44,01Fig.. 3. Fig 5 is a cross vsection in the line 5 5.` Fig. G is asidevien'` of agblank or dummy lock-bar.

' In Fig. 1 the lock is shown as a locking shown in. Letters Patent No.'v1,485,620 issued 1 to. this inventor March 4,1924. In thisv case thelock is set in a mortise 6 ofthe door 7 suitably securedtherein, as byscrews 8,

- a slot 16 in the'bottom of the casing when 13 and tongue 14, With thebolt 11. One or more of the plates, preferably all of them,

.y for the sake of better security, are provided with a depending lug15, which drops into in the unlockedposition, and iny a similar slot 17'when in the locking position. The i. under sides of theplates arenotched'at 18 v(and at 19 for va doublekey lock), the notches coincidingoperably with keyholes 20 and 21 inthe sides of the casing. In

. vWidth the notches may be all alike, but vary indepth to coincide withvarying' steps in the Wing of the key,as shown in Figs; 4 and 5.vIn'these figures thevariations are shown,

Aof Figs. 4 and 1924. serial Nairoifioa as symmetrical, so thekey may.operate from either side,-but yin many locks this would ynot Abe'necessary, and the variations might extend to the Whole gang. yIn a gangetten members, fas herein indicated, the possible changeswould bealmostl innumerable.r y

VIt-.ivill be evident thatthe turning .of .a

key corresponding to the steppingoi` the"y lock-plates will .first littthe Whole `gang ofr` platesout of their locked position, and then shiftthem endivise, with a reverse movement i as the key` is turned in theyopposite direction; .In the endwise movement the boltis' carried bytheplates, and shot in and out oflocklrng` position. f At each terminus oftmovement ythe plates drop by gravity,tand arethemselves locked bytheirflugs in' the slots 'I the casing.' y I s y v The double-keyconstruction is not essen-, tial in all. locks, but is desirable 'forlocks in ollice buildings, and the'like, since the notchy ing" for onekey may be all alike,l and: a

singlemaster key serves for* allithe locks.y

The notching is preferably, butl not ,necesh sarily,fsimpler.than thatemployed for the other'key, as Will' be seen lby a comparison Not all.of the plates need to benotch'ed i as shown inFig. 8. yOne or more wouldbe suflicient to carry the bolt vendwise as the key isturned.Accordingly the construction may be simplified .by making some of theplates as shown in -Fig. 6, to serve as lifting vand locking plates,-butnot `as thrust-plates.

A keyless inside locking device is shown in Figs'. 1, 2 and To the caseis pivotedl a trip-lever 22provided with lateral lingers 23 registeringwith the slots in the casingx 'The longer arm of the lever engages thebolt by a .stud,24. yTo the bodyof the lever is attached a turn-button25 operable kfrom the tise, and is most conveniently attached by innerside of the door. 'This is necessarily attached after the lock is inplace in its morscrewing together, as shown in Fig. 2.-

-Turning the button serves to both `disengage .the look-.plates from thecasing` and slide the bolt. In order to do so, however, the release ofthe lockt-plates must precedeftheir sliding. v `Accordingly thevlever isslotted at 26 to pro- Vvidethe necessary lost motionifor the doubleoperation. l Anfoffset in the'casing at 27 ad* mits of themounting` ofthe lever Without proj ectinglaterally beyond the general face of thecasing.` This is duplicated on each side of the casing, and the leverbeing symloo inetrical, may be attached at either side when the positionof the lock needs to be reversed. The lever, as will be evident, servesas a support for one end of the bolt, and prevents its withdrawal fromthe casing. But in changing the lock, as is necessary from time to timein club-rooms and the like, it is the work of but a moment to de` tachthe lever, when the bolt and connected plates slide out of the open endot' the casing, and the plates may then beshifted at will. A slot 2S isprovided tor the boit-stud to play in.

In Figs. 2 and 3 the inner walls` of the casing are shown ribbedendwise. rlhis is to prevent any possible releasing of the lockplates bythe use of a sharp instrument applied to an outer plate through thekey-hole or other opening, and simultaneously pressing the platestogether and lifting them. Even it' this were possible in asmooth-walled casing, it would not be so with the side-walls roughened,since the rough surface would hold the adjacent plate from rising withthe rest of the gang, and the lock could not thus be released.

Having thus described my invention, l claim;

l. ln a lock, a casing, a plate slidab'ly mounted in said casing andhaving its end edges perpendicularly disposed to its bottoni edge andits top edge obliquely disposed in relation t0 the other edges so as toslant downwardly and rearwardly, said upper.

edge of the plate being provided with a notch, a bolt in the casinghaving a detent engageable in the notch, the bottom ot said casing beingprovided with a pair ot spaced openings, a detent on the rear end of theplate engageable in said openings7 said plate provided with a notch forthe reception ot a l-:ey in order that the rear end thereof may belifted to release the detent on the plate from the opening and to slidethe plate lor moving the bolt.

2. In a lock, a casing, a plate slidable in the casing, a bolt in theupper portion of the casing, said Yplate being disposed below the boltand having the edge adjacent thereto slanted rearwardly, the forward endof said edge being provided with a notch, a detent depending 'from thebolt extending into said notch, the lower edge of said plate at the rearend being provided with a. detent, the bottom of said casing beingprovided with spaced openings tor receiving the last mentioneil detent,and said plate being provided with a s ot for the reception of a key inorder that it may be rocked to littthe rear end of the plate so as torelease the detent on the plate from one of the openings in the casingand st as to slide the plate in the casing tor actuation of the bolt.

3. 1n a lock, a casing, a plate siidably mounted in said casing andhaving its end edges perpendicularly disposed to its bottom edge and itstop edge obliquely disposed in rel ation to the other edges so as toslant downwardly and rearwardly, said upper edge ot the plate beingprovided with a notch, a bot in the casing having a detent eab-le in thenotch` the bottom of said being provided with a pair oi' spacedopenings7 a ioclrable member mounted on the bottom ot' the casingexteriorly thereof and having lateral projecting ends alternatelyprojectable through the openings in the bottom ot the casing, a detenton the rear end ot the plate engageable in said openings, said platebeing provided with a notch for the reception or a key in order that therear end thereof may be lifted to release the detent on the platetti-oni the openings and to slide the plate for moving the bolt.

in testimony whereof I alii); my signature.

SHURE LiiitsoN.

